一种新的跳时多址DCSK系统设计与分析  

A Novel Time-Hopping Multiple-Access DCSK System Designing and Analysis

作　　者：李辉[1,2] 宋耀良[1] 杨余旺[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,南京210094 [2]河南理工大学电气工程与自动化学院,焦作454010

出　　处：《电子与信息学报》2009年第3期756-758,共3页Journal of Electronics & Information Technology

摘　　要：常见差分混沌键控(DCSK)系统的多址方案存在两个问题,首先所有用户共享同一时隙,只能利用混沌信号的低互相关性来降低多址干扰。其次发送的参考信号和数据信号并不相同或相反,破坏了DCSK系统的良好抗多径性。该文提出了DCSK系统一种新颖的跳时多址方式。该方式给每个用户分配不同的伪随机跳时码,根据跳时码参考信号和数据信号进行相同量的跳时。从理论上给出了多址系统在加性高斯白噪声信道中的误码率解析式。分析和仿真表明该跳时多址方式可以很好地解决上述两个问题,而且具有更低的误码率。The common multiple-access schemes for Differential Chaos Shift Keying （DCSK） system have two disadvantages. Firstly, all users share the same slot, only method to decrease multiple-access interference is utilizing the low correlativity of chaotic signal. Secondly, the transmitted signals for reference and symbol are not same or reverse, so the strong anti-multipath character is destroyed. A novel time-hopping multiple-access scheme for DCSK system is put forward. It assigns different PN time-hopping codes to different users. The signals for reference and symbol in a frame have the same time-hopping value. In AWGN channel the system＇s bit error rate is obtained in theory. Analysis and simulation show that time-hopping multiple-access scheme can overcome above two disadvantages and has lower bit error rate.

关 键 词：混沌通信 差分混沌键控 跳时 多址干扰 

分 类 号：TN918[电子电信—通信与信息系统]